I had to look it up to put this close call of 0.8 light years in perspective. Pluto is about 6 light HOURS away. I’m not sure what the oort cloud is all about, but I’m not sure any disturbances that far away would have had much effect on the earth.
The gravity of the passing sun would have been so small to have had no effect on our solar system.
The wikipedia entry agrees, and the footnotes lead somewhere useful:
> We show that given the low mass and high velocity of the binary system, the encounter was dynamically weak. Using the best available astrometry, our simulations suggest that the probability that the star penetrated the outer Oort Cloud is $\sim$98%, but the probability of penetrating the dynamically active inner Oort Cloud ($<$20 kAU) is $\sim$10$^{-4}$. While the flyby of this system likely caused negligible impact on the flux of long-period comets, the recent discovery of this binary highlights that dynamically important Oort Cloud perturbers may be lurking among nearby stars.
http://arxiv.org/abs/1502.04655
http://iopscience.iop.org/2041-8205/800/1/L17/
http://www.pas.rochester.edu/~emamajek/flyby.html
http://www.sciencedaily.com/releases/2015/02/150217114121.htm
The binary is rocketing along one light year every 3645.8 years.